Sharpener for lawn-mowers.



`Patented Nqv. I9, |901'.

F. P. ROGERS.

. SHABPENEB FOR.LAWN MUWERS.

(Application led June 29, 1901.)

(No Model.)

TN: ncmms PETERS co. moomrfxq.. w/snmavon, n. c.

^ ter, in the county of Worcester and State of UNITED STATES SHARPENER 'LAWN-MowERs.

SPECIFIcATIoN forming pei-t orner/eers Patent No. 686,955, dated November 19, 1901. l

Application flied tenete, 1901.

Z'o all whom t mrtg/concern,.-

Be it known that l, FRANK P. ROGERs,a citizen of the United States, residing at Worces- Massachusetts, have invented certain new, and useful Improvements in Sharpeners for Lawn-Mowers, of which the following is a specification.

My invention relates to mowing-machines, and to that class of m owing-machines termed lawn-mowers, and particularly to a detachable sharpening device to be attached to the mower to sharpen the knife-blades without removing the same.

The object of my invention is to provide a sharpener for lawn-mowers of simple con-I struction and operation, and which may be adjusted for diiferent widths of mowers and be readily attached to the mower without removing any of its parts and be used to sharpen the knife-blades by simply turning the wheels of the mower to cause the knife-blades to be brought into contact with the sharpeningstone or abrading-surface, which is securely held in position, but may be adjusted or moved toward the blades as Vit becomes worn during the operation of sharpening.

My invention consists in certain novel features of construction of my improvements in a sharpening device for lawn-mowers, as will be hereinafter fully described.

Referring to the drawings, Figure 1 is a rear view of a lawn-mower, shown by broken lines with my sharpening device combined therewith and shown by full lines. Fig. 2 is a plan view of my sharpening device. A portion at the left is broken away to show the construction. Fig. 3 is a cross-section on line 3 3, Fig. 2, looking in the direction of arrow a, same figure. Fig. et is a cross-section on line 4 4,-Fig. 2, looking in the direction of arrow b, same ligure. Fig. 5 is a plan view of one end of the sharpening device shown in Fig. 2 with the top plate removed; and Fig. 6 is a cross-section on line 6 6, Fig. 2, looking in the direction of arrow c, same figure.

In the accompanying drawings, in Fig. 1, is shown by broken lines portions of a lawnmower of ordinary construction having a handle portion 1 attached to the swivel-yoke portion 2, two wheels 3 3, the roller4, adjust- Serial No. 66,459. (No model.)

ably mounted in the side brackets 5, and the three knife-blades 6, secured at their ends on the circular disks 7, which revolve with the wheels 3 3 to cause'the knife-blades 6 to have a rotary motion, all in the ordinary way. p

I will now describe my sharpening device,l

which consists, preferably, of the base-plate 8, to each end of which upon the under side is secured an angle-iron 9, which is adjustable on the base-plate 8 by means of a bolt lOvandrnut 11, the bolt 1O-eXtending through a slot 9 in the angle-iron 9, as'shown in Fig. 3. By means of adjustability of the angleirons 9 the distances between Lthe vertical arms 9" ofthe angle-iron 9 may be varied according to the width of the machine on which the Sharpener is to be used. Each vertical arm of the angle-iron 9 has a slot 9 therein, which is adapted to receive the end of a bolt 11', which secures the slotted brackets 4 on each end of the roller 4c to the stands 5 on the mower, as shown in Fig. 1. The vertical portions 9l of the angle-irons 9 extend upon the outside of the brackets 4:' and stand 5,. as shown'in Fig. 1, and by means of the angleirons 9 the sharpening device is secured in place on the mower, as above described.

The base-plate 8 has thereon two grooved ways 8', which are slotted longitudinally and adapted to receive the two tongues 12 on theadjusting-plate 12, which tongues 12 are held in the grooved portions 8 to move back and forth therein by means of a screw 13, screwed into the plate 12 and having a washer under its head which extendsover the sides of the slot 8'? in the ways 8,- as shown in Fig. 6. The adjusting-plate 12fhas the projections 12" on its inner surface, which are adapted to extend into corresponding-shaped recesses in the inner surface of the sharpening-stone or abrading-surface 14, as shown in Figs. 2 and 5, to connect the stone to the adjustingplate 12 and cause it to move therewith. In case of a narrow mower the stone 14 will be made shorter and connected with the adjusting-plate 12 by only one or two of the projections 12" at each end instead of by three, as shown in Fig. 5. In this way I can use the same sharpening device for three sizes or widths of mowers. A top plate 15 extends over the inner portion of the adj usting-plate 12 and the inner portion of the sharpening- IOO stone 14 and is secured at its ends to the baseplate 8 by screws 16, as shown in Figs. 2 and 3. Two screws 17 extend through threaded holes in the top plate 15 and are adapted to bear at their inner ends on the upper surface of the sharpening-stone 14, as shown in Figs. 3 and 4, to hold the stone 14 down at its sharp- -ening edge.

The stone 14 and adjusting-plate 12 are moved to carry the sharpening edge of the stone toward the knife-blades 6 or away from said knife-blades in this instance by means of a hand-wheel18, mounted and turning on a threaded pin 19, which is secured at its inner end to the central portion of the adjusting-plate 12, as shown in Fig. 4. The handwheel 18 has a hub 18 thereon which extends into and turns in a bearing 2O on the rear central portion ot' the base-plate 8. A small screw 21 extends through a threaded hole in the base-plate 8, with its inner end extending into an annular groove 18 in the hub 18 of the hand-wheel 18, as shown in Fig. 4. The hand-wheel 18 being held by the screw 21 to prevent its moving lengthwise on the screw 19 will act as 'it is turned in one direction or the other on the threaded pin 19 to move the adjusting-plate 12 and the sharpening-stone 14.

At one end of the adjusting-plate 1 2 I preferably have a detachable holding-lip 22, which extends in a recess in the end of the plate 12 and is secured thereto by a screw 23, and has its projecting end extending into a recess in the inner edge of the stone 14, as shown at the left in Fig. 2. By screwing up the screw 23 I can tighten the lip 22 to bind and hold the sharpening-stone 14 more rigidly.

A handle 24 of any ordinary construction is screwed into a threaded hole in one of the wheels 3 or attached thereto in any ordinary way and is used to turn the wheels and rotate the knife-blades 6 and cause them to come in contact with the inner edge oi the sharpening-stone 14 to be sharpened.

The operation of my sharpening device will be readily understood by those skilled in the art. The attaching angle-irons 9 are adjusted on the base-plate 8 according to the width of the mower and are then attached to lthe brackets 5, which support the roller 4, as above described, and the hand-wheel 18 turned in or out to move the adjusting-plate 12 and the sharpening-stone 14 and bring the edge of the sharpening-stone 14 in position to be engaged by the knife-blades 6 as they are rotated by turning one of the wheels by the handle 24. As the stone 14 becomes worn from the sharpeningoperation,it may be moved nearer the knife-blades 6 by turning the hand-Wheel 18.

The advantages of my improvements in Sharpeners for lawn-mowers will be readily appreciated by those skilled in the art.- It is of very simple construction and operation and can be used on different sizes of lawnmowers and is readily attached to the mower and detached therefrom without removing any of the parts.

It will be understood that the details of construction of certain parts ot' my'sharpening device may be varied if desired.

Having thus described my invention, what' I claim as new, and desire to secure by Letters Patent, isM

1. In a lawn-mower Sharpener, the combination with a base-plate adapted to be secured to the mower, and a top plate, of a sharpening-stone and an adj usting-plate held between said base and top plates, and means for holding and adjusting said adjustingplate and sharpening-stone, substantially as shown and described.

2. In a lawn-mower Sharpener, the combination with the base-plate, and an angleiron or attaching device adjustably secured thereto at each end, and a top plate secured to the base-plate, of an adj listing-plate and a sharpening-stone or abrading-surface secured thereto, said plate and stone extending between said base and top plates, and means for moving said plate and stone to bring the edge of the stone in proper position, substantially as shown and described.

3. In a lawn-mower Sharpener, the combination with the base-plate and an angleiron or attaching device 'adjustably secured thereto at each end, and a top plate secured to the base-plate, of an adj usting-plate and a sharpening-stone secured thereto by projections on said adj usting-plate extending into recesses in the sharpening-stone, and means for moving said adj usting-plate and sharpening-stone to bring the edge of the stone in proper position, substantially as shown and described.

4. In a lawn-mower Sharpener, the combination with the base-plate and an angleiron or attaching device adjustably secured thereto at each end, and a top plate secured to the base-plate, of an adj listing-plate and a sharpening-stone secured thereto, said plate and stone extending between said base and top plates, and the adj usting-plate having tongues thereon to extend and travel in grooved portions in the base-plate, and means for moving said adjusting-plate and sharpening-stone to bring the edge of thev stone in proper position, substantially as shown and described.

Y FRANK P. ROGERS. Witnesses:

J. O. DEWEY, M. HAAs.

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